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{{short description|American electrical engineer}}
'''Keith Lofstrom''' is an ]. He has a BSEE and MSEE from ].<ref>{{Citation
'''Keith Lofstrom''' (born 1953 in ])<ref name="Alcor">{{cite web |url=https://www.alcor.org/library/alcor-member-profiles/keith-lofstrom/ |title=Alcor Member Profile: Keith Lofstrom |author=Chana Phaedra |date=2012 |website= |publisher=Cryonics |access-date=May 17, 2024 |quote=}}</ref> is an American ]. He has a BSEE and MSEE from ].<ref>{{Cite thesis
| last = Lofstrom | last = Lofstrom
| first = Keith | first = Keith
| title = Sinusoidal supply Josephson logic | title = Sinusoidal supply Josephson logic
| journal = U.C. Berkeley masters thesis | publisher = U.C. Berkeley
| type = Master's thesis
| year = 1975 | year = 1975
| url = http://books.google.com/books?id=2WQMGwAACAAJ&dq=sinusoidal.supply.josephson.logic&hl=en&ei=YtYsTqKBGe_4mAWFi_25Dw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCgQ6AEwAA }} | url = https://books.google.com/books?id=2WQMGwAACAAJ&q=sinusoidal.supply.josephson.logic }}
</ref> </ref>
He is more widely known in the ] community for a ground-based space launcher design, the ],<ref>{{cite journal He is more widely known in the ] community for a ground-based space launcher design, the ],<ref>{{cite journal
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| publisher = 21st AIAA, SAE, ASME, and ASEE, Joint Propulsion Conference | publisher = 21st AIAA, SAE, ASME, and ASEE, Joint Propulsion Conference
| location = Monterey, CA | location = Monterey, CA
| date = 8-10 July 1985 | date = 8–10 July 1985
| url = http://launchloop.com/LaunchLoop?action=AttachFile&do=get&target=launchloop.pdf | url = http://launchloop.com/LaunchLoop?action=AttachFile&do=get&target=launchloop.pdf
⚫ }}
| format = PDF
⚫ }}
</ref><ref>{{cite news </ref><ref>{{cite news
| first = Charles | first = Charles
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</ref><ref>{{Cite encyclopedia </ref><ref>{{Cite encyclopedia
| title = Space Towers | title = Space Towers
| last = Bolonkin | last = Alexander Bolonkin
| author-link = :ru:Болонкин, Александр Александрович
| first = Alexander A.
| chapter = 8 | chapter = 8
| editor1-first = Viorel | editor1-last = Badescu | editor1-first = Viorel | editor1-last = Badescu
Line 37: Line 38:
| pages = 146–7 | pages = 146–7
| publisher = ] | year = 2006 | publisher = ] | year = 2006
| isbn = 1402037392 | isbn = 1-4020-3739-2
}} }}
</ref> </ref>
for which he has been credited by name in several works of science fiction.<ref>{{cite journal for which he has been credited by name in several works of science fiction.<ref>{{cite journal
| journal = ] | journal = ]
| last = Pohl | first = Frederick | authorlink = Frederick Pohl | last = Pohl | first = Frederik | author-link = Frederik Pohl
| title = Gateway III — Beyond the Gate (Part 1 of 3) | title = Gateway III — Beyond the Gate (Part 1 of 3)
| page = 80 | page = 80
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}} }}
</ref><ref>{{cite book </ref><ref>{{cite book
| last = Pohl | first = Frederick | authorlink = Frederick Pohl | last = Pohl | first = Frederik | author-link = Frederik Pohl
| title = ] | title = ]
| page = 91 | page = 91
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| volume = 3 | volume = 3
| work = Heechee Saga | work = Heechee Saga
| isbn = 0345300629 | isbn = 0-345-30062-9
}} }}
</ref><ref>{{Cite book </ref><ref>{{Cite book
| last1 = Clarke | first1 = Arthur C. | authorlink1 = Arthur C. Clarke | last1 = Clarke | first1 = Arthur C. | authorlink1 = Arthur C. Clarke
| last2 = Pohl | first2 = Frederick | authorlink2 = Frederick Pohl | last2 = Pohl | first2 = Frederik | authorlink2 = Frederik Pohl
| title = ] | title = ]
| month = February | year = 2009 |date=February 2009
| page = 55 | page = 55
| publisher = ] | location = London | publisher = ] | location = London
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}} }}
</ref><ref>{{Cite book </ref><ref>{{Cite book
| last = Forward | first = Robert L. | authorlink = Robert L. Forward | last = Forward
| first = Robert L.
| author-link = Robert L. Forward
| title = ] | title = ]
| year = 1985 | year = 1985
| page =
| page = v
| publisher = ] | location = London | publisher = ]
| location = London
| isbn = 9780345283498 | isbn = 978-0-345-28349-8
}} }}
</ref> </ref>
], who used the idea in several of his stories, once wrote that, of all the ] concepts, he liked the Lofstrom Loop "best of all."<ref>{{cite journal ], who used the idea in several of his stories, once wrote that, of all the ] concepts, he liked the Lofstrom Loop "best of all."<ref>{{cite journal
| journal = ] | journal = ]
| title = Interview with Frederick Pohl | title = Interview with Frederik Pohl
| page = 98 | page = 98
| publisher = Ultimate Pub. Co | publisher = Ultimate Pub. Co
Line 85: Line 89:
| volume = 69 | volume = 69
| issue = 590 | issue = 590
| url = http://books.google.com/books?ei=Dw8tTr6NO66imQXUhP25Dw&ct=result&id=UG0sAQAAIAAJ&dq=lofstrom+loop&q=best.of.all#search_anchor | url = https://books.google.com/books?id=UG0sAQAAIAAJ&q=best.of.all
}} }}
</ref> </ref>
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| page = 8 | page = 8
| year = 1997 | year = 1997
| isbn = 0780342100 | isbn = 0-7803-4210-0
}} }}
</ref> </ref>
One of his 9 patents is for a way to read an individual digital ID for ] that arises from random atomic variations inherent in the ] process.<ref>{{Citation One of his 9 patents is for a way to read an individual digital ID for ] that arises from random atomic variations inherent in the ] process.<ref>{{cite patent
| inventor-last = Lofstrom | inventor-last = Lofstrom
| inventor-first = Keith | inventor-first = Keith
Line 110: Line 114:
| url = http://www.siidtech.com/index.html | url = http://www.siidtech.com/index.html
| date = Nov 30, 2007 | date = Nov 30, 2007
| accessdate = 2011-07-24 | access-date = 2011-07-24
}} }}
</ref><ref>{{cite journal </ref><ref>{{cite journal
Line 121: Line 125:
| volume = 43 | volume = 43
| url = http://www.siidtech.com/isscc2K.pdf | url = http://www.siidtech.com/isscc2K.pdf
| accessdate = 2011-07-24 | access-date = 2011-07-24
}} }}
</ref> </ref>


One of his more recent efforts in speculative space systems is Server Sky, a very large ] in Earth orbit using ] to power ] computers integrated into the same ] as the PV cells.<ref>{{cite journal One of his more recent efforts in speculative space systems is , a very large ] in Earth orbit using ] to power ] computers integrated into the same ] as the PV cells.<ref>{{cite journal
| last = Lofstrom | first = Keith | authorlink = Keith Lofstrom | last = Lofstrom | first = Keith | author-link = Keith Lofstrom
| journal = Online Journal of Space Communication | journal = Online Journal of Space Communication
| title = Server Sky - Data Centers in Orbit | title = Server Sky - Data Centers in Orbit
Line 135: Line 139:
</ref> </ref>


He is signed up for ] with the ], since 1992.<ref name="Alcor" />
== See also ==

* ]


== References == == References ==


{{Reflist}}
<references/>


== External links == == External links ==
* *
* - IC design consultancy * - IC design consultancy
* - proposed solar-powered satellite-based computing substrate
* , John Chapman, Keith Lofstrom. , Redmond, WA August 14-16.


{{Persondata <!-- Metadata: see ]. -->
| NAME = Lofstrom, Keith
| ALTERNATIVE NAMES =
| SHORT DESCRIPTION =
| DATE OF BIRTH =
| PLACE OF BIRTH =
| DATE OF DEATH =
| PLACE OF DEATH =
}}
{{DEFAULTSORT:Lofstrom, Keith}} {{DEFAULTSORT:Lofstrom, Keith}}
] ]
]
] ]
] ]
]
]
]
]
]

Latest revision as of 14:11, 17 May 2024

American electrical engineer

Keith Lofstrom (born 1953 in Portland, Oregon) is an American electrical engineer. He has a BSEE and MSEE from University of California, Berkeley. He is more widely known in the space advocacy community for a ground-based space launcher design, the Launch Loop, for which he has been credited by name in several works of science fiction. Frederik Pohl, who used the idea in several of his stories, once wrote that, of all the non-rocket spacelaunch concepts, he liked the Lofstrom Loop "best of all."

As an electrical engineer, Lofstrom specializes in mixed-signal integrated circuit design. A paper he wrote on boundary scan methods was one of two to receive an Honorable Mention at the 1997 IEEE International Test Conference. One of his 9 patents is for a way to read an individual digital ID for integrated circuits that arises from random atomic variations inherent in the semiconductor device fabrication process.

One of his more recent efforts in speculative space systems is Server Sky, a very large satellite constellation in Earth orbit using thin-film solar cells to power data center computers integrated into the same wafers as the PV cells.

He is signed up for cryopreservation with the Alcor Life Extension Foundation, since 1992.

References

  1. ^ Chana Phaedra (2012). "Alcor Member Profile: Keith Lofstrom". Cryonics. Retrieved May 17, 2024.
  2. Lofstrom, Keith (1975). Sinusoidal supply Josephson logic (Master's thesis). U.C. Berkeley.
  3. Lofstrom, Keith H. (8–10 July 1985). "The launch loop -- a low cost Earth-to-high orbit launch system - Paper 85-1368" (PDF). Monterey, CA: 21st AIAA, SAE, ASME, and ASEE, Joint Propulsion Conference. {{cite journal}}: Cite journal requires |journal= (help)
  4. Radley, Charles (September 14, 2009). "Local inventor says launch loop would greatly reduce cost of space travel". Gadgets and Tech: Portland Science Examiner. San Francisco: Examiner.com.
  5. Alexander Bolonkin (2006). "8". In Badescu, Viorel; Cathcart, Richard Brook; Schuiling, Roelof D. (eds.). Space Towers. Macro-engineering: a challenge for the future. Springer. pp. 146–7. ISBN 1-4020-3739-2.
  6. Pohl, Frederik (1983). "Gateway III — Beyond the Gate (Part 1 of 3)". Amazing Science-Fiction. 57. Ultimate Pub. Co: 80.
  7. Pohl, Frederik (1983). Heechee Rendezvous. Vol. 3. Ballantine Books. p. 91. ISBN 0-345-30062-9. {{cite book}}: |work= ignored (help)
  8. Clarke, Arthur C.; Pohl, Frederik (February 2009). The Last Theorem. London: HarperVoyager. p. 55. ISBN 978-0-00-729002-4.
  9. Forward, Robert L. (1985). Starquake. London: Ballantine. p. v. ISBN 978-0-345-28349-8.
  10. "Interview with Frederik Pohl". Amazing Science-Fiction. 69 (590). Ultimate Pub. Co: 98. 1995.
  11. IEEE International Test Conference Proceedings. 1997. p. 8. ISBN 0-7803-4210-0.
  12. US 6161213, Lofstrom, Keith, "System for providing an integrated circuit with a unique identification", published Dec 12, 2000, issued Dec 12, 2000 
  13. "A unique, repeatable, individual digital ID". Nov 30, 2007. Retrieved 2011-07-24.
  14. Lofstrom, K.; Daasch, W.; Taylor, D. "IC Identification Circuit using Device Mismatch" (PDF). 2000 IEEE International Solid-State Circuits Conference Digest of Technical Papers. 43. IEEE Cat. No. OOCH37056. Retrieved 2011-07-24.
  15. Lofstrom, Keith (Winter 2010). "Server Sky - Data Centers in Orbit". Online Journal of Space Communication (16).

External links

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